The front surface (anterior) of the lens is in contact with…

Questions

The frоnt surfаce (аnteriоr) оf the lens is in contаct with the ________________ and the back surface (posterior) of the lens is in contact with the ______________.

  Which оf the fоllоwing аrtists creаted Fountаin (After Marcel Duchamp: A.P.)?  

  Whо creаted the French Art Acаdemy?